Mastering Percents with Desmos in Digital SAT Math

The video tutorial covers lesson 16 on using Desmos for digital SAT Math, focusing on percents. It begins with a disclaimer about the limited use of Desmos, then explains how to calculate 'percent of' a number, emphasizing the importance of understanding the mechanics. The tutorial moves on to percent multipliers, detailing how to calculate increases and decreases. It also covers how to determine percent change from multipliers and introduces the percent change formula with examples. The video concludes with practical tips for using Desmos effectively during tests.

How do you convert a percentage to a decimal for calculation purposes?

• Multiply by 100

• Divide by 100

• Subtract 100

• Add 100

What is the formula for calculating a percent increase using a multiplier?

• 1 + (percent / 100)

• 1 - (percent / 100)

• (percent / 100) - 1

• (percent / 100) + 1

If a dress is originally priced at $55 and has a 30% discount, what is the multiplier used to find the discounted price?

• 1.7

• 1.3

• 0.7

• 0.3

How do you calculate the final price after applying multiple percent multipliers?

• Divide all multipliers

• Multiply all multipliers

• Subtract all multipliers

• Add all multipliers

What does a percent multiplier of 1.6 indicate?

• 40% increase

• 40% decrease

• 60% decrease

• 60% increase

How do you find the original percentage increase from a multiplier of 1.15?

• 15% increase

• 85% decrease

• 15% decrease

• 85% increase

Using the percent change formula, what is the percent change from 45 to 92?

• 104.4% increase

• 104.4% decrease

• 47.4% increase

• 47.4% decrease

What does a negative result in the percent change formula indicate?

• A decrease

• An error in calculation

• No change

• An increase

If the new value is less than the old value, what type of percent change does it represent?

• Increase

• Cannot be determined

• Decrease

• No change

What is the correct way to input a division operation in Desmos to ensure the numerator stays intact?

• Use the division symbol immediately

• Type the division symbol followed by the numerator

• Type the numerator followed by the division symbol

• Any of the above methods work equally